Silver Top ring

Ok yesterday I went out to a site that used to have an old high school (grades 9-11 only) from 1902-1972. Lots of hits below 20 on my box but since I did not have a lot of time I thought I’d just dig the 18+ tones. I found some clad and what I thought was a junk kids ring (they had a early elementary school on the property years later). When I get home to clean up my finds and check them out I see the ring has a name inscribed “Tom mix” and on the inside it says Sterling top. I though the top was a mirror. You know the tiny kids rings that you get in a gum machine? Lol
I guess the ring is brass? Anyone ever see these before or know how old it may be?
Thanks for looking.




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